Apsalar seems to have become quite powerful in BH. She kills 307 claws and the clawmaster (what a pussy - anyway...), and has a little fight with the hounds of shadow. Now, the hounds of shadow might be because they think of her as Cotilion, and therefore were not prepared to be attacked.
Let's bring up a few quotes from BH - the ones I could find right not, anyway:
"Never cross this one, Curdle," Telorast hissed. "Never." (page 537)
Page 551 for the fight between Apsalar and HoS - here we see she has gained a lot of weight lately, or she kicks at near-lightspeed (this is a reference to normal laws of physics - I think the actual explanation is that she has gained some powers): "he saw a foot lash out, connect with a beast's head [...] and that head snapped round at the impact, shoulders following, then torso, twisting round"
However, in this fight the hounds are scared by C&T - dragons, even though in rather small shapes. I also think they are confused, as they think the attacker is Cotilion.
And page 844-846 for how she basically slaughters 308 claws.
One thing is, she's made peace with herself and what she is. That much should make sense. Also, a bit older (and thus, a more mature body - I allways gathered she was quite young) would help. In addition, she now seems to be able to access some of Cotilion's memories from after he ascended? In one of her POVs it said something which made me consider that - allthough I seem to remember from DG or so that she could only access his memories up to the point he ascended. Sadly, I can't quite find the quote for it, but it was something along the lines of "not even Cotilion
However, she is quite god-like these days, compared to earlier books, and I can't really find any reason for it. C&T seems like a possible source, but there has been no hinting of it that as far as I can remember. Shadowdance obviously plays some part in it, but how so? The entire dance is somewhat of a mystery to us now, allthough it would seem she inherited the formidable dancing powers (heh...) of Dancer (hence the name). ST seems to clearly state that she is stronger than Cotilion - allthough, he could be talking about anything, really (this is after she killed Pearl - ST says "Not even Cotilion. Not even Cotilion", page 846). Maybe she has a more gracious dance, for all we know.
But ok, Shadow Dance. What do we know of it? It's danced by acolytes (or something similar) in the temples of Rashan and Meanas (or maybe just one of the two, I'm uncertain). It is clearly aspected to the shadowreal - I remember Pearl accepting it as a plausible explanation for the "scent of shadow" around Lostara Yil, after she has talked with Cotilion - well, she had danced too, IIRC, it helped keep her body flexible. This is all from HoC I believe - before she goes out on the quest with Pearl, when she thinks back to when she was in the temple, and Quick Ben (who possibly wasn't QB) visited.
In the previously linked thread, someone says she has ascended - can someone bring up a page to look at? I somehow missed it, and it would explain why she is suddenly so kickarse.
Further ideas to explain her newgained (?) powers?